fix

Author: FumingZhang

src/azure-cli/azure/cli/command_modules/acs/custom.py

@@ -1971,6 +1971,12 @@ def load_kubernetes_configuration(filename):
     except OSError as ex:
         if getattr(ex, 'errno', 0) == errno.ENOENT:
             raise CLIError('{} does not exist'.format(filename))
+        if getattr(ex, 'errno', 0) == errno.EACCES:
+            raise FileOperationError(
+                'Permission denied when trying to read {}. '
+                'Please ensure you have read access to this file, or specify a different file path '
+                'using the --file/-f argument.'.format(filename)
+            )
         raise
     except (yaml.parser.ParserError, UnicodeDecodeError) as ex:
         raise CLIError('Error parsing {} ({})'.format(filename, str(ex)))
@@ -2019,8 +2025,15 @@ def merge_kubernetes_configurations(existing_file, addition_file, replace, conte
                 existing_file_perms,
             )
 
-    with open(existing_file, 'w+') as stream:
-        yaml.safe_dump(existing, stream, default_flow_style=False)
+    try:
+        with open(existing_file, 'w+') as stream:
+            yaml.safe_dump(existing, stream, default_flow_style=False)
+    except PermissionError as ex:
+        raise FileOperationError(
+            'Permission denied when trying to write to {}. '
+            'Please ensure you have write access to this file, or specify a different file path '
+            'using the --file/-f argument.'.format(existing_file)
+        ) from ex
 
     current_context = addition.get('current-context', 'UNKNOWN')
     msg = 'Merged "{}" as current context in {}'.format(